GRD000XS0 - Geological Teaching Collection at Scripps

Record #33 of 5779
GRD000WS0 GRD000YS0

IGSN:

GRD000XS0

Sample ID:

I-34

Sample Type:

Rhyolite

Sample Age:

Cenozoic › Neogene › Miocene
5.3 - 23.0

Number TS:

Storage:

Ritter 154 › Cabinet 15 › Drawer F

Modifiers:

Chalcedony Veins,resorption,porphyry,Flow alignment

Notes:

Ancillary Data Notes:

Age data from McCurry et al 1988, found in USGS Preliminary geologic map of the East Mojave National Scenic Area, California

Series:

Van Winkel Mtns

Location:

California
Van Winkel Mtns, 30 mi NE of Amboy
Latitude: 34.99°
Longitude: -115.29°

Photos:

Notes:

Micrographs:

Notes:

Resorption features in feldspar.

Mag:

2.5

Polarized:

plane

Notes:

Resorption in feldspar and growth patterns in chalcedony.

Mag:

2.5

Polarized:

crossed

Notes:

Mag:

scan

Polarized:

crossed

Thin Sections:

GRD000XT0: Resorbed plagioclase (albite and polysynthetic twinning) with rim overgrowths, some plagiclase exhibit oscillatory zoning, K-spar (microcline twinning), biotite, minor amount of amphibole, glomerocrysts composed of plagioclae, biotite, and oxides, growth patterns in chalcedony, (C. Eichler)

Documents:

N/A

References:

N/A

Geological Teaching Collection

Geological Teaching Collection

IGSN: GRD000XS0 Sample ID: I-34 Permalink